Add IQueryable.contains(T) method and implement overrides where suitable · eclipse-equinox/p2@c43af59

The minor version should be the same for version 2.8.0, since no new APIs have been added since version 2.7.100

ExpressionParser implements non-API interface IExpressionConstants

IContextExpression<T> implements non-API interface IExpression

IFilterExpression leaks APIs from the superinterface IExpression

IMatchExpression<T> implements non-API interface IExpression

IQueryWithIndex<T> implements non-API interface IQuery<T>

ExpressionMatchQuery<T> implements non-API interface IMatchQuery<T>

MatchQuery<T> implements non-API interface IMatchQuery<T>

The minor version should be the same for version 2.8.0, since no new APIs have been added since version 2.7.100

AbstractArtifactRepository implements non-API interface IArtifactRepository

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